GCC Code Coverage Report
Directory: ../../../ffmpeg/ Exec Total Coverage
File: src/libavcodec/jacosubdec.c Lines: 63 81 77.8 %
Date: 2019-11-18 18:00:01 Branches: 51 70 72.9 %

Line Branch Exec Source
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/*
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 * Copyright (c) 2012 Clément Bœsch
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 *
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 * This file is part of FFmpeg.
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 *
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 * FFmpeg is free software; you can redistribute it and/or
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 * modify it under the terms of the GNU Lesser General Public
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 * License as published by the Free Software Foundation; either
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 * version 2.1 of the License, or (at your option) any later version.
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 *
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 * FFmpeg is distributed in the hope that it will be useful,
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 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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 * Lesser General Public License for more details.
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 *
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 * You should have received a copy of the GNU Lesser General Public
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 * License along with FFmpeg; if not, write to the Free Software
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 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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 */
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/**
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 * @file
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 * JACOsub subtitle decoder
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 * @see http://unicorn.us.com/jacosub/jscripts.html
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 */
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#include <time.h>
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#include "ass.h"
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#include "jacosub.h"
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#include "libavutil/avstring.h"
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#include "libavutil/bprint.h"
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#include "libavutil/time_internal.h"
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#undef time
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static int insert_text(AVBPrint *dst, const char *in, const char *arg)
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{
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    av_bprintf(dst, "%s", arg);
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    return 0;
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}
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static int insert_datetime(AVBPrint *dst, const char *in, const char *arg)
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{
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    char buf[16] = {0};
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    time_t now = time(0);
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    struct tm ltime;
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    localtime_r(&now, &ltime);
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    if (strftime(buf, sizeof(buf), arg, &ltime))
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        av_bprintf(dst, "%s", buf);
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    return 0;
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}
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static int insert_color(AVBPrint *dst, const char *in, const char *arg)
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{
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    return 1; // skip id
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}
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static int insert_font(AVBPrint *dst, const char *in, const char *arg)
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{
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    return 1; // skip id
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}
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static const struct {
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    const char *from;
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    const char *arg;
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    int (*func)(AVBPrint *dst, const char *in, const char *arg);
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} ass_codes_map[] = {
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    {"\\~", "~",        insert_text},       // tilde doesn't need escaping
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    {"~",   "{\\h}",    insert_text},       // hard space
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    {"\\n", "\\N",      insert_text},       // newline
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    {"\\D", "%d %b %Y", insert_datetime},   // current date
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    {"\\T", "%H:%M",    insert_datetime},   // current time
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    {"\\N", "{\\r}",    insert_text},       // reset to default style
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    {"\\I", "{\\i1}",   insert_text},       // italic on
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    {"\\i", "{\\i0}",   insert_text},       // italic off
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    {"\\B", "{\\b1}",   insert_text},       // bold on
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    {"\\b", "{\\b0}",   insert_text},       // bold off
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    {"\\U", "{\\u1}",   insert_text},       // underline on
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    {"\\u", "{\\u0}",   insert_text},       // underline off
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    {"\\C", "",         insert_color},      // TODO: color
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    {"\\F", "",         insert_font},       // TODO: font
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};
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enum {
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    ALIGN_VB = 1<<0, // vertical bottom, default
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    ALIGN_VM = 1<<1, // vertical middle
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    ALIGN_VT = 1<<2, // vertical top
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    ALIGN_JC = 1<<3, // justify center, default
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    ALIGN_JL = 1<<4, // justify left
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    ALIGN_JR = 1<<5, // justify right
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};
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static void jacosub_to_ass(AVCodecContext *avctx, AVBPrint *dst, const char *src)
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{
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    int i, valign = 0, halign = 0;
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    char c = av_toupper(*src);
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    char directives[128] = {0};
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    /* extract the optional directives */
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    if ((c >= 'A' && c <= 'Z') || c == '[') {
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        char *p    = directives;
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        char *pend = directives + sizeof(directives) - 1;
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        do *p++ = av_toupper(*src++);
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        while (*src && !jss_whitespace(*src) && p < pend);
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        *p = 0;
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        src = jss_skip_whitespace(src);
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    }
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    /* handle directives (TODO: handle more of them, and more reliably) */
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    if      (strstr(directives, "VB")) valign = ALIGN_VB;
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    else if (strstr(directives, "VM")) valign = ALIGN_VM;
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    else if (strstr(directives, "VT")) valign = ALIGN_VT;
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    if      (strstr(directives, "JC")) halign = ALIGN_JC;
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    else if (strstr(directives, "JL")) halign = ALIGN_JL;
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    else if (strstr(directives, "JR")) halign = ALIGN_JR;
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    if (valign || halign) {
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        if (!valign) valign = ALIGN_VB;
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        if (!halign) halign = ALIGN_JC;
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        switch (valign | halign) {
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1
        case ALIGN_VB | ALIGN_JL: av_bprintf(dst, "{\\an1}"); break; // bottom left
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        case ALIGN_VB | ALIGN_JC: av_bprintf(dst, "{\\an2}"); break; // bottom center
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        case ALIGN_VB | ALIGN_JR: av_bprintf(dst, "{\\an3}"); break; // bottom right
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        case ALIGN_VM | ALIGN_JL: av_bprintf(dst, "{\\an4}"); break; // middle left
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        case ALIGN_VM | ALIGN_JC: av_bprintf(dst, "{\\an5}"); break; // middle center
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        case ALIGN_VM | ALIGN_JR: av_bprintf(dst, "{\\an6}"); break; // middle right
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        case ALIGN_VT | ALIGN_JL: av_bprintf(dst, "{\\an7}"); break; // top left
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        case ALIGN_VT | ALIGN_JC: av_bprintf(dst, "{\\an8}"); break; // top center
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        case ALIGN_VT | ALIGN_JR: av_bprintf(dst, "{\\an9}"); break; // top right
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        }
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    }
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    /* process timed line */
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    while (*src && *src != '\n') {
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        /* text continue on the next line */
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        if (src[0] == '\\' && src[1] == '\n') {
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            src += 2;
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            while (jss_whitespace(*src))
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                src++;
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            continue;
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        }
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        /* special character codes */
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8380
        for (i = 0; i < FF_ARRAY_ELEMS(ass_codes_map); i++) {
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            const char *from = ass_codes_map[i].from;
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            const char *arg  = ass_codes_map[i].arg;
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            size_t codemap_len = strlen(from);
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            if (!strncmp(src, from, codemap_len)) {
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                src += codemap_len;
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                src += ass_codes_map[i].func(dst, src, arg);
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                break;
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            }
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        }
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        /* simple char copy */
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        if (i == FF_ARRAY_ELEMS(ass_codes_map))
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            av_bprintf(dst, "%c", *src++);
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    }
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}
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static int jacosub_decode_frame(AVCodecContext *avctx,
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                                void *data, int *got_sub_ptr, AVPacket *avpkt)
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{
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    int ret;
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    AVSubtitle *sub = data;
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    const char *ptr = avpkt->data;
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    FFASSDecoderContext *s = avctx->priv_data;
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    if (avpkt->size <= 0)
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        goto end;
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    if (*ptr) {
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        AVBPrint buffer;
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        // skip timers
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        ptr = jss_skip_whitespace(ptr);
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        ptr = strchr(ptr, ' '); if (!ptr) goto end; ptr++;
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        ptr = strchr(ptr, ' '); if (!ptr) goto end; ptr++;
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        av_bprint_init(&buffer, JSS_MAX_LINESIZE, JSS_MAX_LINESIZE);
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        jacosub_to_ass(avctx, &buffer, ptr);
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        ret = ff_ass_add_rect(sub, buffer.str, s->readorder++, 0, NULL, NULL);
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        av_bprint_finalize(&buffer, NULL);
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        if (ret < 0)
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            return ret;
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    }
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end:
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    *got_sub_ptr = sub->num_rects > 0;
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    return avpkt->size;
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}
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AVCodec ff_jacosub_decoder = {
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    .name           = "jacosub",
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    .long_name      = NULL_IF_CONFIG_SMALL("JACOsub subtitle"),
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    .type           = AVMEDIA_TYPE_SUBTITLE,
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    .id             = AV_CODEC_ID_JACOSUB,
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    .init           = ff_ass_subtitle_header_default,
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    .decode         = jacosub_decode_frame,
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    .flush          = ff_ass_decoder_flush,
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    .priv_data_size = sizeof(FFASSDecoderContext),
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};